Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
fabpot/php-cs-fixer	require-dev	pin	^1.11 -> 1.11.2
guzzlehttp/guzzle (source)	require	pin	^6.1 -> 6.1.1
mmoreram/php-formatter	require-dev	pin	^1.1 -> 1.1.0
phpunit/phpunit (source)	require-dev	pin	^5.3 -> 5.3.2

📌 Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges to your config if you instead don't wish to pin dependencies.

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